Indian River County Sheriff Deryl Loar says Nicholas Marr pretended to slap a homeless man he offered $20, but instead Marr knocked him out. A friend then posted the video on Facebook, leading to their arrests.

Lawyers for Boston Marathon bomber Dzkokhar Tsarnaev rested their case in his federal death penalty trial Tuesday after presenting a brief case aimed at showing his late older brother was the mastermind of the 2013 terror attack.